User Agent and Assistive Technology Support Notes

Note: Although embed is widely supported in user agents - it is not a valid part
of HTML or XHTML.

Description

The objective of this technique is to provide alternative content for the
embed element in a noembed element. The noembed is rendered
only if the embed is not supported. While it can be positioned anywhere on the
page, it is a good idea to include it as a child element of embed so that it is
clear to assistive technologies that a text alternative is associated with the
embed element it describes.